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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aca62bc2851efb20b1a59082ae637b23f7f95c64e1f97888c4781606620a4a' 
  AND token = '7y02RGBQYAGO5xr9e5WKxBPFN77EYtNn7LGonFm/Bzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}